Default settings assume that clients will register "A" records themselves, and the DHCP server will register PTR records, but legacy and non-Windows clients may not support dynamic registration.
Dynamic DNS registrations can be secure and non-secure. Although non-secure registrations conform to the RFC standard, it has a major drawback of allowing anyone on the network—even those nodes never authenticated by domain controllers—to write to the zone file.
This does not necessarily mean that they do not have write access to any other record in the zone file. Non-secure updates are suitable for smaller environments that are isolated from the outside world.
Usually this defaults to Kerberos. DNS zones that are integrated with Active Directory can be configured to allow secure-only registrations, where anonymous parties are not allowed to introduce their addresses into the system. This configuration is not at all recommended because it does not allow administrators to configure DNS server for Secure only updates, and it does not allow the DNS database to get replicated automatically to the other DNS servers along with the Active Directory replication process.
On the selected tab, choose Secure only option from the Dynamic updates drop-down list. Primary Menu Skip to content. Search for: Search Button. Secondary Menu Skip to content. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. In this way, it is not necessary to configure a separate DNS replication topology that uses ordinary DNS zone transfers because all zone data is replicated automatically by means of Active Directory replication.
This simplifies the process of deploying DNS and provides the following advantages:. When the client receives a response to this query, the client sends an SOA query to the first DNS server that is listed in the response. After the SOA query is resolved, the client sends a dynamic update to the server that is specified in the returned SOA record. If this update fails, the client repeats the SOA query process by sending to the next DNS server that is listed in the response.
After the primary server that can perform the update is contacted, the client sends the update request, and the server processes it. The contents of the update request include instructions to add A, and possibly PTR, resource records for " newhost.
The server also checks to make sure that updates are permitted for the client request. For standard primary zones, dynamic updates are not secured. Any client attempt to update succeeds. For Active Directory-integrated zones, updates are secured and performed using directory-based security settings. Dynamic updates are sent or refreshed periodically. By default, computers send an update every twenty-four hours. If the update causes no changes to zone data, the zone remains at its current version, and no changes are written.
Updates that cause actual zone changes or increased zone transfers occur only if names or addresses actually change. Names are not removed from DNS zones if they become inactive or if they are not updated within the update interval of twenty-four hours.
DNS does not use a mechanism to release or to tombstone names, although DNS clients do try to delete or to update old name records when a new name or address change is applied. This value determines how long other DNS servers and clients cache a computer's records when they are included in a query response. Scope clients can use the DNS dynamic update protocol to update their host name-to-address mapping information whenever changes occur to their DHCP-assigned address.
This mapping information is stored in zones on the DNS server. This enables the client to notify the DHCP server as to the service level it requires. In this case, the option is processed and interpreted by Windows Server-based DHCP servers to determine how the server initiates updates on behalf of the client.
This is the default configuration for Windows. To configure the DHCP server to register client information according to the client's request, follow these steps:.
By default, updates are always performed for newly installed Windows Server-based DHCP servers and any new scopes that you create for them.
The following examples show how this process varies in different cases. For these DHCP clients, updates are typically handled in the following manner:.
After you integrate a zone, you can use the access control list ACL editing features that are available in the DNS snap-in to add or to remove users or groups from the ACL for a specific zone or for a resource record.
For more information, search for the "To modify security for a resource record" topic or the "To modify security for a directory integrated zone" topic in Windows Server Help. By default, dynamic update security for Windows Server DNS servers and clients is handled in the following manner:. Windows Server-based DNS clients try to use nonsecure dynamic updates first.
If the nonsecure update is refused, clients try to use a secure update. Also, clients use a default update policy that lets them to try to overwrite a previously registered resource record, unless they are specifically blocked by update security. By default, when you use standard zone storage, the DNS Server service does not enable dynamic updates on its zones.
0コメント